Loop monitor checks up on emergency shutdown
A
Moore Industries International product story
Edited by the Engineeringtalk editorial team
Sep 7, 2004
The HIM Hart loop monitor can now onfirm that the Fisher Fieldvue DVC6000 Series digital valve controller is performing a partial valve stroke test to validate emergency shutdown valve operation.
The HIM Hart loop monitor now has the ability to confirm that the Fisher Fieldvue DVC6000 Series digital valve controller is performing a partial valve stroke test to validate proper emergency shutdown (ESD) valve operation and, if the test has failed, to alert the user that the ESD valve is stuck.
Partial valve stroke testing is an alternative to periodically testing critical ESD valves without completely stroking them, which normally means a disruptive process shutdown.
As part of its unique Hart diagnostic data, the DVC6000 digital valve controller sends digital information on the Hart loop when a partial valve stroke test is in progress and if the ESD valve is stuck.
Mounted transparently on the Hart loop, the HIM continuously monitors the Hart data from the DVC6000.
When a valve stroke test is initiated, the HIM sends an alarm trip (relay) output to confirm that the test is in progress.
Should the valve be stuck shut, the HIM initiates a second alarm to alert operator and maintenance personnel of the valve's potentially dangerous condition.
The HIM can also be set to send alarm trips outputs based on any of the DVC6000's diagnostic field device status byte data including if the standard Hart fault conditions are detected: smart device configuration changed; primary and non-primary variable out of limits; primary variable analogue output out of limits or fixed; cold start; field device malfunction and more status available.
The HIM's two or three analogue outputs allow valve parameters, such as valve travel and output pressure, to be monitored and reported to the DCS via standard 4-20mA signals.
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